US9078563B2 - Method of manufacturing implantable wireless sensor for in vivo pressure measurement - Google Patents
Method of manufacturing implantable wireless sensor for in vivo pressure measurement Download PDFInfo
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- US9078563B2 US9078563B2 US12/612,070 US61207009A US9078563B2 US 9078563 B2 US9078563 B2 US 9078563B2 US 61207009 A US61207009 A US 61207009A US 9078563 B2 US9078563 B2 US 9078563B2
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- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/0215—Measuring pressure in heart or blood vessels by means inserted into the body
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- A—HUMAN NECESSITIES
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- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
- A61B5/02055—Simultaneously evaluating both cardiovascular condition and temperature
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- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6879—Means for maintaining contact with the body
- A61B5/6882—Anchoring means
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
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- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0247—Pressure sensors
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- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
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- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
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- A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential
- A61N1/36514—Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by a physiological quantity other than heart potential, e.g. blood pressure
- A61N1/36564—Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by a physiological quantity other than heart potential, e.g. blood pressure controlled by blood pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
Definitions
- This invention relates to methods of manufacturing implanted sensors for wirelessly sensing pressure, temperature and other physical properties within the human body. More particularly, the invention concerns a method of manufacturing a wireless, un-powered, micromachined pressure sensor that can be delivered using catheter-based endovascular or surgical techniques to a location within an organ or vessel.
- a sensor placed within the chambers of the heart can be used to record variations in blood pressure based on physical changes to a mechanical element within the sensor. This information is then transferred through a wire from the sensor to an extracorporeal device that is capable of translating the data from the sensor into a measurable value that can be displayed.
- the drawback of this type of sensor is that there must be a wired connection between the sensor and the extracorporeal device, thus limiting its use to acute settings.
- An implantable sensor of this type must be assembled using the materials and fabrication methods that ensure appropriate biocompatibility and long term mechanical and electrical durability.
- One method of manufacturing a sensor capable of measuring pressure is to use a capacitor that is assembled such that one of the capacitive plates will be displaced with respect to the other as a result of exposure to externally applied stress. This displacement will result in a change in the capacitance that is proportional to the applied stress.
- Various patents describe the fabrication and use of capacitor-based pressure sensors. The primary limitation of many of these inventions is that the techniques used to fabricate the sensors do not lend themselves to the miniaturization necessary for it to be configured as an implantable medical device while maintaining the capability of communicating wirelessly with external electronics.
- a number of patents detail pressure sensors (some capacitive in nature, some manufactured using MEMS based fabrication methods) that are specifically designed for implantation into the human body. These sensors suffer from many of the limitations already mentioned, with the additional concerns that they require either the addition of a power source to operate the device or the need for a physical connection to a device capable of translating the sensor output into a meaningful display of a physiologic parameter.
- the device described in the Chubbuck patent is large, thus requiring surgical implantation and thereby limiting its applicability to areas that are easily accessible to surgery (e.g., the skull).
- the present invention comprises a method for manufacturing a device for monitoring the pressure within is the heart or the vasculature by implanting a pressure sensor in such locations utilizing catheter-based endovascular or surgical techniques and using extracorporeal electronics to measure the pressure easily, safely, and accurately.
- a recess is formed in a first wafer, and a capacitor plate is formed in the recess of the first wafer.
- a second capacitor plate is formed in a corresponding region of a second wafer. The two wafers are mutually imposed and affixed to one another such that the two capacitor plates are arranged in parallel, spaced-apart relation.
- a method of manufacturing a sensor for in vivo applications comprises the step of providing three wafers of an electrically non-conductive material. First and second capacitor plates are formed on an upper surface of the first wafer. A third capacitor plate is formed on a lower surface of the second wafer. The first and second wafers are then to mutually imposed such that the third capacitor plate is positioned in generally parallel, spaced-apart relation from the first and second capacitor plates. An inductor coil is positioned on top of an upper surface of the second wafer, and the leads of the inductor coil are electrically connected to the first and second capacitor plates.
- a cavity is formed in the third wafer sufficient to receive said inductor coil, and the third wafer is positioned on top of the second wafer with the inductor coil being received within the cavity of the third wafer. Finally, the second wafer is bonded to the first and third wafers.
- a method of manufacturing a sensor for in vivo applications comprises the steps of forming a bottom plate on a wafer of electrically insulating material, forming a sacrificial layer over the bottom plate, forming a top plate on top of the sacrificial layer, and removing the sacrificial layer to leave the bottom and top plates in spaced-apart relation.
- FIG. 1 is a perspective view of a first embodiment of an implantable wireless sensor according to the present invention, with the sensor body shown as transparent to reveal interior detail.
- FIG. 2 is a schematic view of two pressure sensitive capacitor plates being formed in recessed trenches on two substrate wafers.
- FIG. 3 is a schematic view showing the wafers of FIG. 2 imposed in face-to-face relation.
- FIG. 4 is a schematic view showing the imposed wafers of FIG. 3 being laser-cut around their peripheries.
- FIG. 5 is a schematic view of an alternate embodiment of two imposed wafers in which only one of the wafers has a recessed trench.
- FIG. 6 is a schematic view illustrating a first step in a process for manufacturing wafers with capacitor plates formed thereon.
- FIG. 7 is a schematic view illustrating a second step in a process for manufacturing wafers with capacitor plates formed thereon.
- FIG. 8 is a schematic view illustrating a third step in a process for manufacturing wafers with capacitor plates formed thereon.
- FIG. 10 shows another embodiment in which two capacitor plates are formed on one wafer.
- FIG. 11 illustrates the embodiment of FIG. 10 showing the two capacitor plates on the single wafer connected to opposite ends of a helical inductor coil.
- FIG. 12 is a schematic view of still another embodiment of an implantable, wireless pressure sensor.
- FIG. 13 is a schematic view of a further embodiment of an implantable, wireless pressure sensor in which a three-dimensional inductor coil is built onto the top of through connection terminals on the backside of a capacitor plate substrate.
- FIG. 14 is a schematic view of another embodiment of a wireless pressure sensor in which each subsequent layer is alternately spaced slightly smaller or larger in diameter than the previous winding.
- FIG. 15 is a schematic view of a further embodiment of an implantable, wireless pressure sensor in which a three-dimensional inductor coil is built onto the surface of a cylinder.
- FIG. 16 is a schematic view of another embodiment of a wireless pressure sensor in which the pressure sensitive capacitor and three-dimensional inductor coil are formed is together on one wafer.
- FIG. 17 is a schematic view showing a first step in the manufacturing process of the wireless pressure sensor of FIG. 16 .
- FIG. 18 is a schematic view showing a second step in the manufacturing process of the wireless pressure sensor of FIG. 16 .
- FIG. 19 is a schematic view showing a third step in the manufacturing process of the wireless pressure sensor of FIG. 16 .
- FIG. 20 is a schematic view showing a fourth step in the manufacturing process of the wireless pressure sensor of FIG. 16 .
- FIG. 21 is a schematic view showing a fifth step in the manufacturing process of the wireless pressure sensor of FIG. 16 .
- FIG. 22 shows a first arrangement for electrically to and mechanically interconnecting a capacitor plate to an inductor coil.
- FIG. 23 shows a second arrangement for electrically and mechanically interconnecting a capacitor plate to an inductor coil.
- FIG. 24 is a schematic view of another embodiment of a wireless pressure sensor in which the pressure sensitive capacitor and three-dimensional inductor coil are formed on two wafers.
- FIG. 25 is a schematic view showing a first step in the manufacturing process of the wireless pressure sensor of FIG. 24 .
- FIG. 26 is a schematic view showing a second step in the manufacturing process of the wireless pressure sensor of FIG. 24 .
- FIG. 27 is a schematic view showing a third step in the manufacturing process of the wireless pressure sensor of FIG. 24 .
- FIG. 28 is a schematic view showing a fourth step in the manufacturing process of the wireless pressure sensor of FIG. 24 .
- FIG. 29 is a schematic view of an embodiment of a wireless pressure sensor utilizing four wafers.
- FIG. 30 is a schematic view showing a first step in the manufacturing process of the wireless pressure sensor of FIG. 29 .
- FIG. 31 is a schematic view showing a second step in the manufacturing process of the wireless pressure sensor of FIG. 29 .
- FIG. 32 is a schematic view showing a third step in the manufacturing process of the wireless pressure sensor of FIG. 29 .
- FIG. 33 is a side view of a pressure sensor and a retention mechanism of a delivery device, with the retention mechanism in a closed configuration.
- FIG. 34 is a side view of the pressure sensor and retention mechanism FIG. 33 , with the retention mechanism in an open configuration.
- FIG. 35 is a side view of the pressure sensor and retention mechanism FIG. 33 , with the retention mechanism in an closed configuration and shown in cross-section.
- FIG. 36 is a side view of the pressure sensor and retention mechanism FIG. 33 , with the retention mechanism in an open configuration and shown in cross-section.
- FIG. 38 is a side view of a delivery device comprising the retention mechanism of FIG. 33 and the shaft of FIG. 37 , illustrating a first step in the delivery of a sensor into the wall of a septum.
- FIG. 39 is a side view of the delivery device of FIG. 38 , illustrating a second step in the delivery of a sensor into the wall of a septum.
- FIG. 40 is a side view of the delivery device of FIG. 38 , illustrating a third step in the delivery of a sensor into the wall of a septum.
- FIG. 41 is a side view of the delivery device of FIG. 38 , illustrating a fourth step in the delivery of a sensor into the wall of a septum.
- FIG. 42 is a side view of an alternate embodiment of a delivery device for delivering a sensor into the wall of a septum, with the retention mechanism of the delivery device in a closed configuration.
- FIG. 43 is a side view of the delivery device of FIG. 42 showing the retention mechanism in an open configuration.
- FIG. 44 is an isometric view of a sensor comprising an alternate arrangement for anchoring the sensor within a lumen of a patient.
- FIG. 45 is a top view of the sensor of FIG. 44 .
- FIG. 46 is a top view showing the sensor of FIG. 44 lodged within a lumen.
- FIG. 47 is a side cutaway view of a shaft of a delivery apparatus for implanting the sensor of FIG. 44 .
- FIG. 48 is a side view of a tether wire of a delivery apparatus for implanting the sensor of FIG. 44 .
- FIG. 49 is a side view of a core wire of a delivery apparatus for implanting the sensor of FIG. 44 .
- FIG. 50 is a side view of a guidewire of a delivery apparatus for implanting the sensor of FIG. 44 .
- FIG. 51 is a side cutaway view of a delivery apparatus comprising the components of FIGS. 47-50 with the sensor of FIG. 44 mounted thereto.
- FIG. 1 illustrates a sensor 10 for the measurement of physical parameters.
- the sensor can be fabricated using micro-machining techniques and is small, accurate, precise, durable, robust, biocompatible, and insensitive to changes in body chemistry, or biology. Additionally, the sensor can incorporate radiopaque features to enable fluoroscopic visualization during placement within the body. Furthermore, this sensor is encased in a hermetic, unitary package of electrically insulating material where the package is thinned in one region so as to deform under a physiologically relevant range of pressure.
- the LC circuit contained in the packaging is configured so that one electode of the capacitor is formed on the thinned region.
- the pressure sensor of the current invention can be attached to the end of a catheter to be introduced into a human body and delivered to an organ or vessel using catheter-based endovascular techniques.
- the senor 10 includes a body 12 .
- the body 12 is formed from electrically insulating materials, preferably biocompatible ceramics.
- the body is comprised of fused silica.
- the sensor 10 comprises a deflectable region 14 at the lower end of the body 12 .
- the body 12 further comprises a lower chamber 19 and an upper chamber 21 .
- the lower capacitor plate 18 is positioned on the inner surface of the deflectable region 14 of the sensor body 12 .
- the upper capacitor plate 16 is positioned on a fixed region of the sensor body 12 .
- a change in ambient pressure at the deflectable region 14 of the sensor 10 causes the deflectable region 14 to bend, thereby displacing the lower plate 16 with respect to the upper plate 18 and changing the capacitance of the LC circuit. Because the change in capacitance of the LC circuit changes its resonant frequency, the resonant frequency of the sensor 10 is pressure-dependent.
- one of the most significant challenges is achieving adequate coupling to the sensor inductor coil from the external readout device at the necessary distance from the outside of the body to the implant site.
- One method for achieving enhanced coupling is to add magnetic material to the inductor.
- this approach is not feasible in a sensor intended for in vivo use, as the magnetic material would be adverse to magnetic resonance imaging, for example.
- an increased coupling coefficient is also achievable by using a three-dimensional inductor coil configuration, as opposed to two-dimensional designs.
- a three-dimensional helical inductor coil configuration 20 is the preferred embodiment for the sensor design.
- the disclosed sensor features a completely passive inductive-capacitive (LC) resonant circuit with a pressure varying capacitor. Because the sensor is fabricated using completely passive electrical components and has no active circuitry, it does not require on-board power sources such as batteries, nor does it require leads to connect to external circuitry or power sources. These features create a sensor which is self-contained within the packaging material and lacks physical interconnections traversing the hermetic packaging, such interconnects frequently being cited for failure of hermeticity. Furthermore, other sensing capabilities, such as temperature sensing, can be added using the same manufacturing techniques. For example, temperature sensing capability can be accomplished by the addition of a resistor with known temperature characteristics to the basic LC circuit.
- the capacitor in the pressure sensor of the disclosed invention consists of at least two conductive elements separated by a gap. If a force is exerted on the sensor, a portion of the sensor deflects, changing the relative position between the at least two conductive elements. This movement will have the effect of reducing the gap between the conductive elements, which will consequently change the capacitance of the LC circuit.
- An LC circuit is a closed loop system whose resonance is proportional to the inverse square root of the product of the inductor and capacitor. Thus, changes in pressure alter the capacitance and, ultimately, cause a shift in the resonant frequency of the sensor. The pressure of the environment external to the sensor is then determined by referencing the value obtained for the resonant frequency to a previously generated curve relating resonant frequency to pressure.
- the inductor Because of the presence of the inductor, it is possible to couple to the sensor electromagnetically and to induce a current in the LC circuit via a magnetic loop. This characteristic allows for wireless exchange of electromagnetic energy with the sensor and the ability to operate it without the need for an on-board energy source such as a battery. Thus it is possible to determine the pressure surrounding the sensor by a simple, non-invasive procedure by remotely interrogating the sensor, recording the resonant frequency, and converting this value to a pressure measurement.
- the interrogating system energizes the sensor with a low duty cycle, gated burst of RF energy having a predetermined frequency or set of frequencies and a predetermined amplitude.
- the energizing signal is coupled to the to sensor via a magnetic loop.
- the energizing signal induces a current in the sensor that is maximized when the frequency of the energizing signal is substantially the same as the resonant frequency of the sensor.
- the system receives the ring down response of the sensor via magnetic coupling and determines the resonant frequency of the sensor, which is then used to determine the measured physical parameter.
- the resonant frequency of the sensor is determined by adjusting the frequency of the energizing signal until the phase of the ring down signal and the phase of a reference signal are equal or at a constant offset. In this manner, the energizing signal frequency is locked to the sensor's resonant frequency and the resonant frequency of the sensor is known. The pressure of the localized environment can then be ascertained.
- Q factor (Q) is the ratio of energy stored versus energy dissipated.
- Q is important is that the ring down rate of the sensor is directly related to the Q. If the Q is too small, the ring down rate occurs over a substantially shorter time interval. This necessitates faster sampling intervals, making sensor detection more difficult. Also, as the Q of the sensor increases, so does the amount of energy returned to external electronics. Thus, it is important to design sensors with values of Q sufficiently high enough to avoid unnecessary increases in complexity in communicating with the sensor via external electronics.
- the Q of the sensor is dependent on multiple factors such as the shape, size, diameter, number of turns, spacing is between the turns and cross-sectional area of the inductor component.
- Q will be affected by the materials used to construct the sensors. Specifically, materials with low loss tangents will provide a sensor with higher Q factors.
- the body of the implantable sensor of the disclosed embodiment of the present invention is preferably constructed of ceramics such as, but not limited to, fused silica, quartz, pyrex and sintered zirconia, that provide the required biocompatibility, hermeticity and processing capabilities. These materials are considered dielectrics, that is, they are poor conductors of electricity but are efficient supporters of electrostatic or electroquasistatic fields. An important property of dielectric materials is their ability to support such fields while dissipating minimal energy. The lower the dielectric loss, the lower the proportion of energy lost, and the more effective the dielectric material is in maintaining high Q.
- Capacitors and inductors made by a variety of methods can be manufactured separately, joined through interconnect methods and encapsulated in hermetic packaging.
- the pressure sensitive capacitor 15 and the three-dimensional inductor coil 20 are formed separately and joined together to form the LC circuit.
- the capacitor and inductor coil can be manufactured integral with one another.
- the inductor coil 320 is comprised of the inductor coil body 322 and the coil leads 324 .
- Numerous parameters of the inductor coil can be varied to optimize the balance of size and electrical properties of the circuit, including the materials, coil diameter, wire gage, insulation thickness, number of coil windings, and cross-sectional area of the coil body.
- the material comprising the coil must be highly conductive and also biocompatible. Suitable materials include, but are not limited to, gold, copper, and alloys thereof.
- the inductor coil 320 in sensors of the current invention maintain a high degree of mechanical stability as a change in coil position relative to the capacitor or a change in coil configuration will cause the resonant frequency of the device to change.
- immobilize the inductor coil 320 of the present invention If the wire used to construct the coil is sufficiently strong, the coil can be self-supporting, also known as an “air core” configuration. A solenoid coil is another suitable configuration.
- the coil can be formed around a central bobbin comprised of a suitable material.
- bobbins can be configured to be mechanically fixed to any surface or combination of surfaces defining the coil receiving trench via a press fit.
- the coil can be wound on a thermoplastic bobbin where the thermoplastic material can be subjected to sufficient heat to cause flow to encapsulate and/or adhere to the surface of the coil receiving trench.
- thermosetting or thermoplastic polymer with good high temperature characteristics, low loss tangent, and, optionally, low dielectric constant material can be used to support the coil.
- the polymer should also be highly inert, have excellent aging resistance and exhibit substantially no moisture absorbance or outgassing.
- thermosetting material With the use of a thermosetting material, the polymer is applied to the coil in liquid form and allowed to cure or otherwise harden. Thermoplastic materials can be preformed and inserted between the coil and at least one coil receiving trench wall and subsequently heated to achieve sufficient flow to encapsulate and/or adhere to the coil and at least one coil receiving trench wall.
- Polyimide, fluorinated polymers, glass frit, ceramic paste and liquid crystal polymer are examples of suitable materials for immobilizing the inductor coil 320 due to their thermal, electrical, and mechanical properties.
- manufacturing processes achieving substantially similar results that involve lower processing temperatures would make other material choices desirable, such choices being obvious to one skilled in the art.
- the wire from which the coil is formed can be solid wire, bundled wire or cable, or individually insulated stranded wire.
- the wire gage, coil diameter, cross-sectional area of the coil body, and number of windings all influence the value of inductance and the detection range of the circuit. As any of these properties increase, so do the size and the inductance of the coil, as well as the sensor-to-electronics distance. To specify an inductor coil for use in the sensor, size considerations must be balanced with those of inductance and Q.
- a small scale three-dimensional inductor coil can be formed in a variety of ways. It can be created conventionally. One is such method is machine coil winding of small diameter insulated magnet wire, as shown in FIG. 1 .
- a three-dimensional inductor coil 420 is built onto the top of one of the through connections terminals 480 on the backside of the capacitor plate substrate 442 , using integrated circuit processing techniques and a multitude of layers.
- This coil 420 can be defined and supported by photo-definable dielectric material such as photo-definable polyimide.
- the coil is free standing in air, supported by same-material mechanical elements that are strategically positioned to minimize the effect of the supporting mechanical elements on the electrical function of the coil.
- each subsequent coil 510 is alternately spaced slightly smaller or larger in diameter than the previous winding. This configuration creates a small separation between adjacent coils 510 in the x-y plane, eliminating the need for an extra vertical spacing layer in between windings. This configuration results in a number of coil windings equal to the number of layers, which is more practical for manufacturing using a MEMS approach.
- a three-dimensional inductor coil 555 is built onto the surface of a cylinder 560 of an appropriate material such as, but not limited to fused silica.
- a conductive layer is first applied to the surface of the cylinder 560 .
- a mold is formed onto the surface so that parts of the underlying conductive surface are exposed and some are covered.
- a metal may then be formed onto the exposed areas by electroplating, sputtering or vapor deposition. The exposed area forms a helical trench that extends along the surface of the cylinder, thus realizing an inductor coil.
- the pressure sensitive to capacitor plates 16 , 18 are formed on two separate substrate wafers 40 , 42 in recessed trenches 44 .
- At least one of the wafers 40 has a substrate thickness in the region 46 of the capacitive plate 16 such that sufficient plate deflection occurs due to external pressure change, resulting in a sufficient change in resonant frequency per unit pressure (mm Hg) once the LC circuit has been created.
- the thickness of the wafer 40 in the region 46 can be reduced by suitable chemical or mechanical means, as indicated by the dashed line 47 , to provide the desired range of deflection.
- the wafers 40 , 42 are bonded together such that the capacitive plates are 16, 18 parallel and separated by a gap on the order of 0.1-10 microns, preferably 0.1-2 microns.
- the performances of the sensor are closely related to few fundamental geometrical considerations. Widening or elongating the deflective region will augment its mechanical flexibility, and, in turn, the pressure sensitivity of the sensor. Decreasing the thickness of the deflective area will result in similar improvements. However, thinner deflective region can become too fragile or otherwise more sensitive to systemic response from the host-organism other than changes in mean and pulsatile blood pressure (ex: hyperplasia, tissue overgrowth, etc.). Reducing the gap, while maintaining adequate deflective region thickness, offers a complementary alternative to insufficiently low sensitivity.
- initial air-gap ranging from 0.1 to 10 micrometers
- initial air-gaps ranging from a 0.1 to 2 micrometers are preferable.
- the value of the maximum deflection under maximum load (indexed, for exampled, on physiologically relevant maximum pulsatile blood pressure values, at relevant location in the host-organism) ought to be, in theory, inferior or equal to the value of the initial gap.
- limiting the maximum deflection under maximum load to represent only a fraction of the initial gap (ex: 0.6 micrometer for a 1 micrometer initial gap) will ease the fabrication constraints and result in a more robust and versatile sensor.
- One suitable method for creating the pressure sensitive capacitor is by electroplating the individual plates 16 , 18 in the recessed trenches 44 on a substrate wafer 40 , 42 to a given height H 1 , H 2 that is less than or equal to the depth D 1 , D 2 of the respective trench 44 .
- the capacitive plates are generally separated by the difference between the sum of the trench depths and the sum of the plate heights, (D 1 +D 2 ) ⁇ (H 1 +H 2 ).
- An inherent variation in the height of the plates and the required range of deflection for the full operating pressure range are parameters, which determine the initial separation distance (a.k.a. the gap).
- FIG. 4 illustrates the assembled wafers and capacitor plates laser-cut around their peripheries 48 , reducing the capacitor to its final size and hermetically fusing the two wafers together at 50 .
- a CO2 laser can be used at a peak wavelength of about 10 microns if the substrate is fused silica. Power must be sufficiently large to cut and fuse the wafers together, while at the same time being sufficiently small that the internal components of the sensor are not damaged by excessive heat.
- the wafers are pre-bonded using glass frit to produce a hermetic seal around the cavities.
- the laser cut only releases the sensors from the wafer, and does not provide the primary means of creating the hermetic seal.
- Other suitable methods of hermetically sealing the wafers include, but to are not limited to, adhesives, gold compression bonding, direct laser bonding, and anodic bonding.
- one plate 18 is formed on a substrate wafer 142 having a trench 144 with a depth greater that of the trench 44 in the substrate wafer 40 .
- the other plate 16 is formed on the inner surface of a wafer 140 without a trench. When imposed in face-to-face relation, the plate 16 is received into the lower end of the trench 144 with the plates 16 , 18 disposed in parallel, spaced-apart relation.
- each conductive plate 16 , 18 is built to a target height that slightly exceeds the depth of the recess trench 44 , as shown in FIG. 6 .
- the plates are formed by electroplating. Preferred materials for the plates are copper, gold, and alloys thereof.
- CMP chemical/mechanical polishing
- Another method also begins with the plates 16 , 18 formed to a height that slightly exceeds the depth of the trenches 44 , as shown in FIG. 6 .
- the metal capacitor plates 16 , 18 are mechanically polished to planarize the metal surface down to the surface of the substrate 40 , 42 , as shown in FIG. 7 .
- the metal plates are chemically etched by a selective etchant to the height indicated by the dashed line 56 in FIG. 8 to achieve the desired difference in height between the height of the plate 16 , 18 and the depth of the trench 44 , as shown in FIG. 9 .
- PVD physical vapor deposition
- thin film deposition in conjunction with photolithography.
- PVD is used to deposit a uniform layer of metal, sub-micrometer to tens of micrometers thick, on a wafer.
- a layer of photoresist is deposited, a mask is used to pattern the photoresist, and a selective etching technique is utilized to etch away the extra metal and to define the desired pattern.
- Other methods of defining the metal pattern can be utilized, such as, shadowmasking, a method well known in the art.
- a pressure sensitive capacitor 215 can be formed by separating the bottom conductive pad into two separate regions 218 A, 218 B that capacitively couple to one another via a common third conductive region 216 on the pressure sensitive deflective region.
- the inductor coil 20 is then electrically connected as shown in FIG. 11 , one lead 22 of the coil 20 to the first region 218 A, and the other lead 24 of the coil 20 to the second region 218 B.
- the split plates 218 A, 218 B are preferably located on the fixed side of the capacitor (i.e., opposite the pressure-sensitive side), because the electrical/mechanical interconnects made to the split plates in order to complete the LC circuit are less prone to mechanical failure when the surface to which they are mechanically attached does not deflect or move repetitively.
- the plate on the top wafer 42 is separated by a dielectric into two conductive regions 318 A, 318 B, with one region 318 B substantially larger than the other 318 A.
- the smaller conductive region 318 A is electrically connected to the outer edge of the pressure sensitive plate 316 , spanning the air gap with a laser weld that is performed through the substrate material.
- the laser wavelength is selected so that it is passes through the substrate material with minimal energy absorption, but heats the conductive plate sufficiently to produce the weld connection between the top and bottom plates 316 , 318 A.
- sensors embodied by the current invention can have capacitive and inductive elements maintained in separate hermetic cavities or that these elements may be contained in a single hermetic cavity.
- the pressure sensitive capacitor 15 needs to be connected to the three-dimensional inductor coil 20 while maintaining a hermetic seal around the internal cavity that defines the separation gap between the capacitive plates 16 , 18 .
- This can be achieved by using a variety of through-wafer interconnection methods, familiar to those skilled in the art.
- through holes or vias 660 are formed in an upper wafer 662 to provide mechanical and electrical access to a pair of upper capacitor plates 664 , 666 .
- the wafer through-holes can be formed before or after plate formation using some combination of the following techniques: laser drilling, chemical (wet) etching, conventional or ultrasonic machining, or dry etching. As shown in FIG.
- the vias 660 can optionally be filled with gold, copper, or other suitable conductive material to form through-wafer interconnects 668 in conductive communication with the capacitor plates 664 , 666 .
- the through-wafer interconnects 668 thus form a hermetic seal.
- Leads from an inductor coil (not shown) are attached to the through-wafer interconnects 668 to place the leads in conductive communication with the capacitor plates 664 , 666 .
- through holes or vias 680 are formed in an upper wafer 682 to provide mechanical and electrical access to a pair of lower capacitor plates 684 , 686 . Electrical connections to the lower capacitor plates 684 , 686 will be accomplished through leads of the inductor coil (not shown) or through wires or other suitable conductive means.
- Thermosonic or ultrasonic bonding can be used to connect the inductor coil to either an electrode of a capacitor or a through-wafer interconnect.
- Thermosonic and ultrasonic bonding are types of wire bonding used for metal wires including, but not limited to, gold wires. Typical temperatures required for thermosonic bonding are between 125-220° C., and bonding occurs when a combination of static and ultrasonic mechanical and thermal energy is delivered to the metallic coil wire to be bonded to a metal surface. Ultrasonic bonding is performed just as thermosonic bonding but without the use of heat.
- Useful materials for the metallized bond sites and coil comprise gold, copper and aluminum and alloys thereof. Bonds can be formed between certain dissimilar metals as well as between all like metals, and such combinations are widely known in the art.
- the coating must be removed prior to bonding.
- the coating can be removed to expose the metal at the adhesion point so that bonding can occur by either mechanical or chemical means.
- the parameters (e.g. time, heat, pressure) of the thermosonic bonding process can be altered and the geometry of the bonding tool modified so that reliable mechanical and electrical interconnects are created. Such modifications cause the coating material to be pushed aside, exposing the metal at the bonding site and extruding the wire slightly. This latter technique provides certain advantages because it reduces the number of manufacturing steps.
- solder bump An alternate method of conductively connecting the coil to the capacitive plates is the solder bump. Solder is applied to the metal-metal interface of the coil and electrode or interconnect to form a mechanical and electrical connection. This method can be used for capacitor plate or through-wafer interconnections. Lead-free solder should be used for biocompatibility. Connection can also be achieved through IC processing techniques, which allow for plates and coils to be formed in electrical contact with one another. Finally laser welds, as previously discussed, can be used to achieve electrical/mechanical interconnects.
- FIG. 16 illustrates a surface micromachined, capacitor coupled sensor 600 .
- the capacitor structure 602 comprises at least two plates 604 , 606 , at least one 604 of which is built directly atop a first wafer 608 .
- This plate 604 will be referred to as the bottom plate.
- the region of the wafer 608 where the bottom plate 604 is built will be referred to as the deflective region 610 . If necessary, the thickness of the wafer 608 in the region of the deflective region 610 can be reduced in thickness to enhance its deformability.
- the other plate 606 is suspended above the bottom plate 604 .
- the top plate 606 is mechanically anchored to the deflective region by pillar-like supporting elements 612 located at the periphery of the bottom plate 604 .
- Bottom and top plates 604 , 606 are electrically insulated and physically separated from one another by an air gap 614 .
- the top electrode 606 mechanical design, material and dimensions are carefully chosen so that the suspended part of the electrode does not structurally deform under its own weight or creep over time.
- a coil 616 of relevant geometry and inductance value is built or assembled using, as an example, any of the methods described herein. Its terminals are electrically and mechanically connected to either one of the opposite plates 604 , 606 of the capacitor 602 .
- a capsule 618 or other form of hermetic surrounding is used to encapsulate both the coil 616 and capacitor 602 .
- the fabrication process of the disclosed embodiment employs a technique known in the art as “sacrificial layer.”
- a sacrificial layer is a structural layer that remains buried throughout the fabrication process under various layers of material until it can be removed, releasing the structures and layers built on top of the sacrificial layer. Once removed, a void remains in place of the sacrificial layer. This void forms the air gap that separates top from bottom plate(s).
- a sacrificial layer must abide by at least two rules: (1) it must remain unaffected (no cracking, peeling, wrinkling, etc.) during the entire fabrication process until it is removed, and (2) selective and efficient removal techniques must exist to remove it without adverse consequences to any remaining structures.
- the fabrication of the capacitor 602 starts with the creation of the bottom plate 604 on the wafer 608 , using physical vapor deposition and photolithography.
- the backside of the wafer 608 is optionally thinned to enhance compliance in the deflective region 610 of the wafer at the location of the bottom plate 604 so as to facilitate deflection when a force or a pressure is applied.
- the anchoring sites 612 are defined at the periphery of the bottom plate 604 .
- Anchoring sites 612 are small enough to represent only a fraction of the footprint of either bottom or top plate 604 , 606 . However, they are big enough to insure reliable mechanical anchoring for the top plate 606 .
- a layer 630 of material with desirable physical and chemical traits is deposited onto the wafer 608 over the bottom plate 604 and the anchoring sites 612 to serve as a sacrificial layer.
- the sacrificial material is, but is not limited to, a thin film of photo-definable polymer (the first polymer layer).
- the thickness of the polymer is tuned by altering the conditions during deposition. Film thicknesses ranging from fractions of micrometers to tens of micrometers are achieved routinely. To insure that the layer 630 of photo-definable polymer remains unaffected (no cracking, peeling, wrinkling, etc.) during the entire fabrication process until it is removed, proper curing and cross-linking precautionary steps must be taken.
- windows 632 are opened in the first polymer layer 630 .
- the window geometry and in-plane location corresponds to those of the anchoring sites 612 .
- each opening (a.k.a. window) in the first polymer layer is surrounded by sidewalls 634 which height corresponds to the thickness of the first polymer layer.
- a thin film metallic layer 640 is then deposited on top of the sacrificial layer 630 , as depicted in FIG. 19 .
- This layer comprises a seed layer, as it will provide a site upon which electroplated metals can grow later on.
- the method of deposition should insure that the metallic film 640 evenly coats the upper surface of the sacrificial layer 630 (the first polymer layer) as well as the sidewall 634 and the bottom areas of the windows 632 previously defined in the sacrificial layer.
- a second layer 650 of photo definable polymer (the second polymer layer) is deposited and patterned using photolithography. During this process, selected regions are removed from the surface of the substrate, defining new windows 652 (large openings) in the second polymer layer 650 without affecting any other previously deposited layer (especially the first polymer layer 630 ).
- the in-plane geometry of the new windows represents the in-plane geometry of the top electrode 606 ( FIG. 17 ).
- the geometry of the new windows extends to encompass the geometry and location of the anchor sites 612 .
- Regions where the photo definable polymer has been removed are subjected to a method known as electroplating.
- electroplating occurs at the same time at the anchoring sites, on the sidewalls, and on any other region exposed through windows opened in the second polymer layer.
- the resulting structure is a continuous electroplated film 660 of the desired thickness.
- the thickness can range from few micrometers to few tens of micrometers. Electroplated copper is preferred for its ease of deposition and low cost.
- the second polymer layer 650 , the metal layer 640 , and the sacrificial layer 630 are removed using wet or dry selective removal techniques.
- the preferred removal technique for both the second polymer layer 650 and the sacrificial layer 630 is wet dissolution in appropriate solvents such as acetone.
- both bottom and top plates 604 , 606 are formed.
- the top plate 606 is suspended above the bottom plate 604 and separated from it by an air gap 614 , which corresponds to the thickness of the first polymer layer.
- the coil 616 is built or assembled using any of the methods described herein. Its terminals are electrically and mechanically connected to either one of the opposite plates 604 , 606 of the capacitor 602 . Finally, as shown in FIG. 16 , the capsule 618 or other form of hermetic surrounding is assembled onto the wafer 608 to encapsulate the coil 616 and capacitor 602 .
- a sensor 700 comprises a thick upper wafer 702 and a thinner lower wafer 704 .
- the thin lower wafer 704 comprises the pressure-sensitive deflective region portion 706 of the sensor 700 .
- a notch 708 is optionally formed in the upper wafer 702 to accommodate an anchor, such as a corkscrew, hook, barb, or other suitable stabilization means.
- the notch can be created on the backside of the wafer directly if the cap is sufficiently thick to accommodate the notch and a separation distance between the bottom of the notch and the coil body without causing any parasitic, deleterious electromagnetic or mechanical effects on the sensor function.
- the notch can be created by using wet or dry methods in a separate wafer or plurality of wafers and then bonded to the backside of the sensor.
- the notch can have a variety of regular or irregular geometries and can have rough or smooth sidewalls—any configuration achievable by conventional technologies that would impart some advantage or feature to assist in fixing the anchor mechanism to the sensor.
- a capacitor 710 comprises a lower plate 711 formed on the inner surface of the lower wafer 704 and an opposing pair of upper plates 712 , 714 formed on the lower surface of the upper wafer 702 .
- a channel 716 is formed in the upper wafer 702 to receive an inductor coil 718 .
- the inductor coil 718 includes leads 720 that conductively connect the opposite ends of the coil to the upper plates 712 , 714 .
- a dicing trench 730 is formed in the lower portion of the upper wafer 702 (shown inverted for the manufacturing process).
- the dicing trench 730 is a feature, which comprises a reduction in thickness of the wafer 702 along a line that defines the perimeter of the sensor 700 .
- the dicing trench 730 is advantageous where reduction of the amount of energy transferred to the sensor during dicing is needed, for example, to protect the sensor from heat damage when dicing with a laser. When the wafer thickness is reduced, less energy is required to cut the sensor from the rest of the wafer, and thus less thermal energy is transferred to the critical components of the sensor.
- the channel 716 is formed in the upper surface of the upper wafer 702 .
- the lower capacitor plates 712 , 714 are formed on the upper surface of the upper wafer 702 .
- a recess 732 is formed is in the upper surface of the lower wafer 704 .
- the recess optionally includes troughs 734 for providing clearance for the leads 720 of the inductor coil 718 ( FIG. 24 ).
- the lower capacitor plate 711 is formed in the base of the recess 732 in the upper surface of the lower wafer 704 .
- the inductor coil 718 is introduced into the annular recess 716 of the upper wafer 702 .
- the two leads 720 of the inductor coil 718 are connected to the upper capacitor plates 712 , 714 .
- the lower wafer 704 is now inverted and positioned atop the upper wafer 702 .
- a laser is then used to cut and simultaneously heat bond the wafers 702 , 704 at the lines 750 to complete fabrication of the sensor 700 . Because of the presence of the dicing trenches 730 , the laser need cut through only a thickness corresponding to the double arrow 752 . This shallow cut minimizes the amount of thermal energy transferred to the internal components of the sensor.
- FIGS. 29-32 depict an embodiment of a sensor 800 manufactured from four stacked wafers, 802 , 804 , 806 , and 808 .
- the bottom wafer 802 comprises the pressure-sensitive deflective region 810 and a pair of capacitor plates 812 , 814 formed on its upper surface.
- the second wafer 804 comprises a capacitor plate 816 formed on its lower surface and a pair of through-holes 818 for electrical connections.
- the third wafer 806 comprises a cylindrical cavity 820 for accommodating an inductance coil 822 . Leads 824 of the inductance coil 822 extend through the holes 818 in the second wafer 804 and connect to the capacitor plates 812 , 814 .
- the fourth wafer 808 fits atop the third wafer to provide a sealed structure.
- FIG. 30 illustrates a first step in the process for manufacturing the sensor 800 .
- a recess 830 is formed in the upper surface of the bottom wafer.
- the plates 812 , 814 are formed in the base of the recess 830 .
- the plate 816 is formed on the upper surface of the second wafer 804 , and the through holes 818 are formed at the periphery of the plate 816 .
- the second wafer is then inverted and stacked on top of the first wafer.
- the coil 822 is positioned atop the second wafer, and electrical connections are made through the holes 818 to the lower plates 812 , 814 .
- the third substrate wafer 806 is prepared with the deep recess 820 , sufficient to contain the inductor coil 822 .
- the recess 820 can be formed in a variety of ways, including laser rastering, glass machining, and ultrasonic machining.
- This third wafer 806 is bonded to the second wafer 804 and subsequently, the sensors are cut out using a laser to release the sensors from the wafer stack and form the hermetic seal in the process of the cut.
- FIGS. 33-36 illustrate a sensor 1001 suitable for use within an organ such as the heart.
- the sensor 1001 has a generally cylindrical body 1002 that hermetically houses the capacitor and inductor elements previously described.
- the sensor 1001 further has a pressure sensitive surface 1003 ( FIGS. 35 and 36 ) on one end of the cylindrical body 1002 and a screw-type anchoring device 1004 extending upward from the opposite end of the body.
- FIGS. 33-41 illustrate a first embodiment of a delivery device 1000 ( FIGS. 38 , 40 , and 41 ) for implanting a pressure sensor 1001 in a heart chamber.
- the sensor 1001 has a generally cylindrical body 1002 that houses the capacitor and inductor elements previously described.
- the sensor 1001 further has a pressure sensitive surface 1003 ( FIGS. 35 , 36 , and 41 ) on one end of the cylindrical body 1002 and a screw-type anchoring device 1004 extending upward from the opposite end of the body.
- a retention mechanism 1005 of the delivery device 1000 comprises a “clamshell” housing 1006 wherein left and right housing halves 1008 , 1010 are resiliently deformable with respect to one another, much in the manner of a clothespin.
- the housing 1006 has a recess 1012 ( FIGS. 35 and 36 ) formed in its upper end, dimensioned to receive the sensor 1001 therewithin.
- a reverse-threaded bore 1014 is formed in the lower end of the housing 1006 , and a smooth counterbore 1016 is formed in the lower end of the housing 1006 coaxially with the threaded bore 1014 .
- a screw 1018 has a reverse-threaded shaft 1019 and a screw head 1020 .
- the screw head 1020 is mounted to the upper end of a dual-coil, flexible, torqueable shaft 1022 .
- a portion of the outer coil 1026 is removed for purposes of illustration to show the inner coil 1028 , which is counterwound with respect to the outer coil 1026 .
- the reverse-threaded screw 1018 threadably engages the reverse-threaded bore 1014 in the lower end of the retention mechanism 1005 .
- the screw head 1020 advances into the smooth counterbore 1016 in the base of the housing 1006 , the lower ends of the two housing halves 1008 , 1010 are spread apart. This causes the upper ends of the housing halves 1008 , 1010 to close together, thereby grasping the sensor 1001 .
- delivery of the sensor 1001 of the invention to a heart chamber may be accomplished as follows.
- the physician gains access into a vein that is suitable for access into the right ventricle using methods such as the Seldinger technique. Examples of these access sites would be the right jugular, left subclavian, or right femoral veins.
- a guidewire is advanced into the right ventricle.
- a large vessel introducer with an adjustable hemostatic valve is inserted over the guidewire and advanced until its tip is positioned in the right ventricle.
- the sensor 1001 is mounted to the delivery device 1000 with the longitudinal axis of the device oriented normal to the pressure-sensitive surface of the sensor and with the anchor or stabilizer 1004 facing the distal end of the shaft 1022 .
- the sensor anchor 1004 can be covered with a soluble, biocompatible material, or a thin, retractable diaphragm cover (not shown). The purpose of such covering is to conceal the anchoring mechanism or stabilizer 1004 and to protect the heart from inadvertent damage during sensor positioning prior to engaging the anchoring mechanism (which, in the case of the disclosed sensor 1001 is configured to engage the tissue of the septum).
- a torqueable, kink-resistant, shaped guiding catheter (not shown) can be loaded over the shaft 1022 of the delivery device 1000 in order to provide additional means for steering the sensor 1001 into position.
- the characteristics of this guiding catheter are that the outer diameter is small enough to fit within the introducer sheath, and the inner diameter is large enough to load over the shaft 1022 of the delivery device 1000 .
- the shaft 1022 of the delivery device 1000 is rotated in a clockwise direction to screw the anchor 1004 of the sensor into the tissue 1030 of the septum.
- the sensor 1001 tightens against the wall 1032 of the septum and creates a resistance. This resistance is sufficient to overcome the resistance between the reverse-threaded screw 1018 and the corresponding reverse-threaded bore 1014 in the housing 1006 of the retention mechanism 1005 . Consequently, continued rotation of the shaft 1022 of the delivery device 1000 in the clockwise direction will withdraw the screw 1018 from its bore 1014 , as illustrated in FIG. 40 .
- the lower ends of the two housing halves 1008 , 1010 return to their normal, closed configuration, thereby opening the upper ends of the two housing halves and releasing the sensor 1001 , as depicted in FIG. 41 .
- the delivery device 1000 is then withdrawn from the patient, leaving the sensor 1001 anchored to the wall 1032 of the septum with its pressure-sensing surface 1003 facing outward.
- a feature of the disclosed embodiment is the use of a reverse-threaded screw 1018 and corresponding bore 1014 so that rotating the shaft 1022 in a normal “tightening” direction will first screw the sensor into the wall of the septum and then open the retention mechanism 1005 to release the sensor 1001 , all without having to reverse direction of rotation of the shaft.
- the screw be sufficiently loose with respect to the retention mechanism that once the sensor has completely screwed into the wall of the septum, the torque resistance will overcome the engagement between the screw and the retention mechanism rather than continue to rotate the sensor 1001 .
- This feature can be accomplished, for example, by controlling the tolerances between the screw 1018 and the retention mechanism 1005 , and by controlling the resilient force exerted by the housing 1006 against the head 1020 of the screw.
- FIGS. 42 and 43 illustrate an alternate embodiment of a retention mechanism 1055 .
- the retention mechanism 1055 is mounted to a flexible, torqueable shaft 1022 , just as in the previously disclosed embodiment.
- the retention mechanism 1055 comprises a plurality of resilient wire fingers 1056 extending upward from a base 1058 .
- the fingers 1056 of the disclosed embodiment are comprised of nitinol, though any suitable resilient biocompatible material can be used. Hooks 1060 at the upper ends of the wire fingers 1056 wrap around the upper edges of the body 1002 of the sensor 1001 .
- there are four such wire fingers 1056 spaced 90° apart around the circumference of the cylindrical sensor body to 1002 although a greater or lesser number of fingers 1056 can be used. Only two fingers 1056 are shown in the drawings for convenience of illustration.
- a spreader 1064 is disposed between the fingers 1056 .
- the spreader 1064 is attached to a pull-wire 1066 , which is extends through the longitudinal opening of the shaft 1022 and to a location outside of the patient.
- a pull-wire 1066 which is extends through the longitudinal opening of the shaft 1022 and to a location outside of the patient.
- the physician desires to release the retention mechanism 1055 from the sensor 1001 , he simply exerts a tension on the pull-wire 1066 .
- the spreader moves downward and biases the fingers 1056 apart, releasing the sensor 1001 from the retention mechanism 1055 .
- the spreader 1064 is a circular disk or a frustocone, but it will be understood that any shape can be used which biases the fingers apart in response to tension applied to the pull-wire 1066 .
- FIGS. 44-46 illustrate a sensor 1100 of the type described above.
- the sensor 1100 has a wire loop 1102 extending outward from the sensor body 1104 .
- the wire loop 1102 causes the sensor 1100 to lodge within a lumen 1106 , with the sensor located centrally within the lumen and allowing blood flow all around in the direction indicated by the arrow 1108 .
- FIGS. 47-51 A delivery apparatus 1150 for securing, delivering and deploying an implant 1100 having an anchoring mechanism 1102 is shown in FIGS. 47-51 .
- the various components of the delivery apparatus 1150 are shown individually in FIGS. 47-50 .
- the delivery apparatus includes an elongated shaft 1152 having proximal and distal ends 1153 , 1154 respectively.
- the shaft 1152 has a main lumen 1155 , which extends the length of the shaft.
- a port 1156 places the main lumen 1155 in communication with the ambient at an intermediate location along the shaft 1152 .
- a secondary lumen 1157 includes a proximal portion 1158 and a distal portion 1159 .
- the proximal portion 1158 extends along a partial length of the shaft 1152 and terminates in a port 1160 in the sidewall of the shaft.
- the distal portion 1159 originates in a port 1161 in the sidewall of the shaft and extends in a distal direction to an end 1162 .
- a tether wire, 1163 shown in FIG. 48 is adapted to be slidably positioned within the secondary lumen 1157 of the shaft 1152 .
- a core wire 1164 shown in FIG. 49 , is configured to be received within the main lumen 1155 of the shaft 1152 and provides stiffness to the delivery apparatus 1150 .
- the core wire 1164 has a decreasing diameter toward its distal end 1165 , providing an increased flexibility in the distal end of the delivery apparatus 1150 .
- the core wire 1164 is fixed in the main lumen 1155 of the shaft 1152 using adhesive, thermocompression, or any other suitable fixation means.
- a conventional guide wire 1166 is dimensioned to extend beyond the distal end 1154 of the shaft 1152 and to be received within a distal portion of the main lumen 1155 of the shaft.
- FIG. 51 shows the delivery apparatus 1150 with sensor 1100 mounted.
- the core wire 1164 is disposed within the main lumen 1155 of the shaft 1152 .
- the tether wire 1163 extends through the proximal portion 1158 of the secondary lumen 1157 of the shaft 1152 and exits through the port 1160 in the shaft sidewall.
- the tether wire 1163 then is threaded through the body 1104 of the sensor 1100 and passed into the port 1161 and hence into the distal portion 1159 of the secondary lumen 1157 .
- the guidewire 1166 extends alongside the proximal portion of the shaft 1152 and enters the main lumen 1155 of the shaft 1152 at the port 1156 .
- the guidewire 1166 then passes through the distal portion of the main lumen 1155 and exits the distal end 1154 of the shaft 1152 .
- a vessel introducer is placed in an access site such as the right internal jugular vein, the subclavian artery, the right femoral vein, or any other suitable access site.
- the guidewire 1164 is inserted through the vessel introducer and guided to the target site using suitable medical imaging technology.
- the delivery apparatus 1150 with sensor 1100 mounted thereto is then threaded over the guidewire and inserted into the vessel introducer.
- the apparatus After the delivery apparatus is in the vessel introducer, the apparatus is navigated over the guidewire to a deployment site in the pulmonary artery.
- the implant 1100 is deployed by pulling the tether wire 1160 proximally to disengage the implant from the shaft 1152 .
- the delivery apparatus and guidewire are then removed from the body.
- the implant 1100 may then “float” through the narrowing pulmonary artery vasculature until it reaches a location at which the vessel is sufficiently narrow that the implant lodges within the vessel, as shown in FIG. 46 . At that point the implant will be firmly anchored within the vasculature.
- the secondary lumen 1157 of the introducer 1150 can comprise a single, uninterrupted lumen having two ports 1160 , 1161 , rather than two separate lumen portions 1158 , 1159 .
- the secondary lumen 1157 can extend all the way through the distal end 1154 of the shaft 1152 , rather than terminating at an end 1160 short of the distal end of the shaft.
Abstract
Description
Claims (24)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
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US12/612,070 US9078563B2 (en) | 2005-06-21 | 2009-11-04 | Method of manufacturing implantable wireless sensor for in vivo pressure measurement |
US14/733,450 US10143388B2 (en) | 2005-06-21 | 2015-06-08 | Method of manufacturing implantable wireless sensor for pressure measurement |
US16/194,103 US11033192B2 (en) | 2005-06-21 | 2018-11-16 | Wireless sensor for measuring pressure |
US17/184,775 US11179048B2 (en) | 2005-06-21 | 2021-02-25 | System for deploying an implant assembly in a vessel |
US17/184,717 US11103146B2 (en) | 2005-06-21 | 2021-02-25 | Wireless sensor for measuring pressure |
US17/184,755 US11103147B2 (en) | 2005-06-21 | 2021-02-25 | Method and system for determining a lumen pressure |
US17/401,365 US11684276B2 (en) | 2005-06-21 | 2021-08-13 | Implantable wireless pressure sensor |
US17/507,268 US11890082B2 (en) | 2005-06-21 | 2021-10-21 | System and method for calculating a lumen pressure utilizing sensor calibration parameters |
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US12/612,070 US9078563B2 (en) | 2005-06-21 | 2009-11-04 | Method of manufacturing implantable wireless sensor for in vivo pressure measurement |
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US16/194,103 Active 2026-05-06 US11033192B2 (en) | 2005-06-21 | 2018-11-16 | Wireless sensor for measuring pressure |
US17/184,755 Active US11103147B2 (en) | 2005-06-21 | 2021-02-25 | Method and system for determining a lumen pressure |
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US17/401,365 Active US11684276B2 (en) | 2005-06-21 | 2021-08-13 | Implantable wireless pressure sensor |
US17/507,268 Active US11890082B2 (en) | 2005-06-21 | 2021-10-21 | System and method for calculating a lumen pressure utilizing sensor calibration parameters |
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US14/733,450 Active 2026-07-22 US10143388B2 (en) | 2005-06-21 | 2015-06-08 | Method of manufacturing implantable wireless sensor for pressure measurement |
US16/194,103 Active 2026-05-06 US11033192B2 (en) | 2005-06-21 | 2018-11-16 | Wireless sensor for measuring pressure |
US17/184,755 Active US11103147B2 (en) | 2005-06-21 | 2021-02-25 | Method and system for determining a lumen pressure |
US17/184,717 Active US11103146B2 (en) | 2005-06-21 | 2021-02-25 | Wireless sensor for measuring pressure |
US17/184,775 Active US11179048B2 (en) | 2005-06-21 | 2021-02-25 | System for deploying an implant assembly in a vessel |
US17/401,365 Active US11684276B2 (en) | 2005-06-21 | 2021-08-13 | Implantable wireless pressure sensor |
US17/507,268 Active US11890082B2 (en) | 2005-06-21 | 2021-10-21 | System and method for calculating a lumen pressure utilizing sensor calibration parameters |
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2015
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2018
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2021
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Non-Final Office Action issued Jun. 12, 2008 by the United States Patent and Trademark Office for U.S. Appl. No. 11/204,812, filed Aug. 16, 2005 (Applicant-Cardio MEMS // Inventor-Cros, et al.) (pp. 1-7). |
Non-Final Office Action issued Jun. 12, 2008 for U.S. Appl. No. 11/668,601, filed Jan. 30, 2007 and issued as U.S. Patent No. 7,595,647 on Sep. 29, 2009 (Inventor-Kroh; Applicant-CardioMEMS) (pp. 1-9). |
Non-Final Office Action issued Jun. 24, 2009 for U.S. Appl. No. 12/349,606, filed Jan. 7, 2009 and issued as U.S. Patent No. 7,679,355 on Mar. 16, 2010 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-7). |
Non-Final Office Action issued Jun. 25, 2010 for U.S. Appl. No. 12/545,166, filed Aug. 21, 2009 and issued as U.S. Patent No. 7,936,174 on May 3, 2011 (Inventor-Kroh; Applicant-CardioMEMS) (pp. 1-7). |
Non-Final Office Action issued Jun. 9, 2006 for U.S. Appl. No. 10/943,772, filed Sep. 16, 2004 and published as U.S. 2005/0187482 on Aug. 25, 2005 (Inventor-O'Brien; Applicant-CardioMEMS) (pp. 1-15). |
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Non-Final Office Action issued Mar. 29, 2007 for U.S. Appl. No. 11/479,527, filed Jun. 30, 2006 and issued as U.S. Patent No. 7,432,723 on Oct. 7, 2008 (Inventor-Ellis; Applicant-CardioMEMS) (pp. 1-8). |
Non-Final Office Action issued Oct. 15, 2010 for U.S. Appl. No. 12/466,595, filed May 15, 2009 and issued as U.S. Patent No. 7,932,732 on Apr. 26, 2011 (Inventor-Kroh; Applicant-CardioMEMS) (pp. 1-6). |
Non-Final Office Action issued Oct. 18, 2008 for U.S. Appl. No. 11/232,534, filed Sep. 22, 2005 and published as U.S. 2006/0287700 on Dec. 21, 2006 (Inventor-White; Applicant-CardioMEMS) (pp. 1-11). |
Non-Final Office Action issued Oct. 29, 2007 by the United States Patent and Trademark Office for U.S. Appl. No. 11/157,375, filed Jun. 21, 2005 (Applicant-Cardio MEMS // Inventor-O'Brien, et al.) (pp. 1-12). |
Non-Final Office Action issued Sep. 20, 2007 for U.S. Appl. No. 10/348,894, filed Jan. 23, 2003 and issued as U.S. Patent No. 7,574,492 on Aug. 11, 2009 (Inventor-Karaoguz; Applicant-CardioMEMS) (pp. 1-8). |
Non-Final Office Action issued Sep. 8, 2006 for U.S. Appl. No. 10/348,894, filed Jan. 23, 2003 and issued as U.S. Patent No. 7,574,492 on Aug. 11, 2009 (Inventor-Karaoguz; Applicant-CardioMEMS) (pp. 1-7). |
Non-Final Rejection issued Jun. 1, 2009 by the United States Patent and Trademark Office for U.S. Appl. No. 11/157,375, filed Jun. 21, 2005 (Applicant-Cardio MEMS // Inventor-O'Brien, et al.) (pp. 1-11). |
Notice of Abandonment issued Feb. 16, 2010 for U.S. Appl. No. 11/232,534, filed Sep. 22, 2005 and published as U.S. 2006/0287700 on Dec. 21, 2006 (Inventor-White; Applicant-CardioMEMS) (pp. 1-2). |
Notice of Abandonment issued Oct. 1, 2007 for U.S. Appl. No. 10/943,772, filed Sep. 16, 2004 and published as U.S. 2005/0187482 on Aug. 25, 2005 (Inventor-O'Brien; Applicant-CardioMEMS) (pp. 1-2). |
Notice of Allowance issued Apr. 4, 2012 for U.S. Appl. No. 13/078,091, filed Apr. 1, 2011 and issued as U.S. Patent No. 8,237,451 on Aug. 7, 2012 (Inventor-Joy; Applicant-CardioMEMS) (pp. 1-7). |
Notice of Allowance issued Aug. 12, 2008 for U.S. Appl. No. 11/479,527, filed Jun. 30, 2006 and issued as U.S. Patent No. 7,432,723 on Oct. 7, 2008 (Inventor-Ellis; Applicant-CardioMEMS) (pp. 1-2). |
Notice of Allowance issued Aug. 15, 2008 for U.S. Appl. No. 11/748,053, filed May 14, 2007 and issued as U.S. Patent No. 7,439,723 on Oct. 21, 2008 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued Aug. 17, 2007 for U.S. Appl. No. 11/748,053, filed May 14, 2007 and issued as U.S. Patent No. 7,439,723 on Oct. 21, 2008 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-8). |
Notice of Allowance issued Aug. 21, 2008 for U.S. Appl. No. 11/717,967, filed Mar. 14, 2007 and issued as U.S. Patent No. 7,466,120 on Dec. 16, 2008 (Inventor-Miller; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued Aug. 25, 2010 for U.S. Appl. No. 12/466,541, filed May 15, 2009 and issued as U.S. Patent No. 7,839,153 on Nov. 23, 2010 (Inventor-Joy; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued Aug. 5, 2011 by the United States Patent and Trademark Office for U.S. Appl. No. 12/416,904, filed Apr. 1, 2009 (Applicant-Cardio MEMS // Inventor-Kroh, et al.) (pp. 1-9). |
Notice of Allowance issued Dec. 15, 2009 for U.S. Appl. No. 12/349,606, filed Jan. 7, 2009 and issued as U.S. Patent No. 7,679,355 on Mar. 16, 2010 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-4). |
Notice of Allowance issued Dec. 16, 2008 for U.S. Appl. No. 11/613,645, filed Dec. 20, 2006 and issued as U.S. Patent No. 7,550,978 on Jun. 23, 2009 (Inventor-Kroh; Applicant-CardioMEMS) (pp. 1-8). |
Notice of Allowance issued Dec. 23, 2010 for U.S. Appl. No. 12/545,166, filed Aug. 21, 2009 and issued as U.S. Patent No. 7,936,174 on May 3, 2011 (Inventor-Kroh; Applicant-CardioMEMS) (pp. 1-7). |
Notice of Allowance issued Dec. 29, 2010 for U.S. Appl. No. 12/466,595, filed May 15, 2009 and issued as U.S. Patent No. 7,932,732 on Apr. 26, 2011 (Inventor-Kroh; Applicant-CardioMEMS) (pp. 1-4). |
Notice of Allowance issued Feb. 14, 2007 for U.S. Appl. No. 11/276,571, filed Mar. 6, 2006 and issued as U.S. Patent 7,498,799 on Mar. 3, 2009 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-3). |
Notice of Allowance issued Feb. 17, 2009 for U.S. Appl. No. 11/613,645, filed Dec. 20, 2006 and issued as U.S. Patent No. 7,550,978 on Jun. 23, 2009 (Inventor-Kroh; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued Feb. 4, 2010 for U.S. Appl. No. 12/349,606, filed Jan. 7, 2009 and issued as U.S. Patent No. 7,679,355 on Mar. 16, 2010 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-2). |
Notice of Allowance issued Jan. 2, 2008 for U.S. Appl. No. 11/748,053, filed May 14, 2007 and issued as U.S. Patent No. 7,439,723 on Oct. 21, 2008 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued Jul. 14, 2008 for U.S. Appl. No. 11/717,967, filed Mar. 14, 2007 and issued as U.S. Patent No. 7,466,120 on Dec. 16, 2008 (Inventor-Miller; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued Jul. 23, 2007 for U.S. Appl. No. 11/276,571, filed Mar. 6, 2006 and issued as U.S. Patent 7,498,799 on Mar. 3, 2009 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-3). |
Notice of Allowance issued Jul. 9, 2009 by the United States Patent and Trademark Office for U.S. Appl. No. 11/204,812, filed Aug. 16, 2005 (Applicant-Cardio MEMS // Inventor-Cros, et al.) (pp. 1-4). |
Notice of Allowance issued Jun. 1, 2009 for U.S. Appl. No. 11/668,601, filed Jan. 30, 2007 and issued as U.S. Patent No. 7,595,647 on Sep. 29, 2009 (Inventor-Kroh; Applicant-CardioMEMS) (pp. 1-7). |
Notice of Allowance issued Jun. 13, 2008 for U.S. Appl. No. 11/276,571, filed Mar. 6, 2006 and issued as U.S. Patent 7,498,799 on Mar. 3, 2009 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued Jun. 18, 2007 for U.S. Appl. No. 11/276,571, filed Mar. 6, 2006 and issued as U.S. Patent 7,498,799 on Mar. 3, 2009 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-2). |
Notice of Allowance issued Jun. 9, 2009 for U.S. Appl. No. 10/348,894, filed Jan. 23, 2003 and issued as U.S. Patent No. 7,574,492 on Aug. 11, 2009 (Inventor-Karaoguz; Applicant-CardioMEMS) (pp. 1-4). |
Notice of Allowance issued Mar. 18, 2011 for U.S. Appl. No. 12/765,970, filed Apr. 23, 2010 and issued as U.S. Patent No. 7,973,540 on Jul. 5, 2011 (Inventor-Kroh; Applicant-CardioMEMS) (pp. 1-8). |
Notice of Allowance issued Mar. 23, 2009 by the United States Patent and Trademark Office for U.S. Appl. No. 11/204,812, filed Aug. 16, 2005 (Applicant-Cardio MEMS // Inventor-Cros, et al.) (pp. 1-7). |
Notice of Allowance issued Mar. 27, 2008 for U.S. Appl. No. 11/479,527, filed Jun. 30, 2006 and issued as U.S. Patent No. 7,432,723 on Oct. 7, 2008 (Inventor-Ellis; Applicant-CardioMEMS) (pp. 1-9). |
Notice of Allowance issued Mar. 31, 2008 for U.S. Appl. No. 11/717,967, filed Mar. 14, 2007 and issued as U.S. Patent No. 7,466,120 on Dec. 16, 2008 (Inventor-Miller; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued Mar. 5, 2008 for U.S. Appl. No. 11/276,571, filed Mar. 6, 2006 and issued as U.S. Patent 7,498,799 on Mar. 3, 2009 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued May 17, 2012 for U.S. Appl. No. 13/078,091, filed Apr. 1, 2011 and issued as U.S. Patent No. 8,237,451 on Aug. 7, 2012 (Inventor-Joy; Applicant-CardioMEMS) (pp. 1-2). |
Notice of Allowance issued May 23, 2008 for U.S. Appl. No. 11/479,527, filed Jun. 30, 2006 and issued as U.S. Patent No. 7,432,723 on Oct. 7, 2008 (Inventor-Ellis; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued May 25, 2012 by the United States Patent and Trademark Office for U.S. Appl. No. 12/416,916, filed Apr. 1, 2009 (Applicant-Cardio MEMS // Inventor-Kroh, et al.) (pp. 1-8). |
Notice of Allowance issued May 8, 2008 for U.S. Appl. No. 11/748,053, filed May 14, 2007 and issued as U.S. Patent No. 7,439,723 on Oct. 21, 2008 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-6). |
Notice of Allowance issued Nov. 21, 2007 for U.S. Appl. No. 11/276,571, filed Mar. 6, 2006 and issued as U.S. Patent 7,498,799 on Mar. 3, 2009 (Inventor-Allen; Applicant-CardioMEMS) (pp. 1-3). |
Notice of Allowance issued Nov. 21, 2007 for U.S. Appl. No. 11/717,967, filed Mar. 14, 2007 and issued as U.S. Patent No. 7,466,120 on Dec. 16, 2008 (Inventor-Miller; Applicant-CardioMEMS) (pp. 1-2). |
Notice of Allowance issued Nov. 6, 2006 for U.S. Appl. No. 11/105,294, filed Apr. 13, 2005 and issued as U.S. Patent No. 7,245,117 on Jul. 17, 2007 (Inventor-Joy; Applicant-CardioMEMS) (pp. 1-2). |
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US11684276B2 (en) | 2023-06-27 |
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US20150342470A1 (en) | 2015-12-03 |
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US20100058583A1 (en) | 2010-03-11 |
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US10143388B2 (en) | 2018-12-04 |
US11179048B2 (en) | 2021-11-23 |
US20210369123A1 (en) | 2021-12-02 |
WO2007002185A2 (en) | 2007-01-04 |
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